my first all grain brew this weekend. it calls for a protein rest at 122f for 15 minutes. so here's my question:

calculator says heat my 14.6 quarts of water to 136F, then add my grains for a protein rest temp of 122F for 15 minutes. can i then just turn the heat on and stir as i bring the mash temp to 152F, where I leave it for 60 minutes in my igloo mash tun?

seems to me that makes more sense than heating part of the water to 122F for the rest, then adding remaining water at higher temperature to try and land at 152F for the mash.

Although I have no experience in this type of mashing protocol, I've read that the risk is scorching of the mash at the bottom of the kettle, and also potentially denaturing needed enzymes in part of the mash that may get too hot...